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<?php |
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namespace Jasny; |
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/** |
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* Check if IP address is in CIDR block |
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* |
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* @param string $ip |
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* @param string $cidr |
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* @return boolean |
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*/ |
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function ip_in_cidr($ip, $cidr) |
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{ |
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if ($cidr === '0.0.0.0/0' || $cidr === '::/0' || $cidr === '::') return true; |
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$ipv = strpos($ip, ':') === false ? 4 : 6; |
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$cidrv = strpos($cidr, ':') === false ? 4 : 6; |
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if ($ipv !== $cidrv) return false; |
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$fn = __NAMESPACE__ . "\\ipv{$ipv}_in_cidr"; |
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return $fn($ip, $cidr); |
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} |
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/** |
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* Check if IPv4 address is in CIDR block |
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* |
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* @param string $ip |
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* @param string $cidr |
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* @return boolean |
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*/ |
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function ipv4_in_cidr($ip, $cidr) |
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{ |
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list($subnet, $mask) = explode('/', $cidr); |
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$ipMasked = ip2long($ip) & ~((1 << (32 - $mask)) - 1); |
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$subnetMasked = ip2long($subnet) & ~((1 << (32 - $mask)) - 1); |
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return $ipMasked == $subnetMasked; |
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} |
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/** |
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* Converts inet_pton output to string with bits |
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* |
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* @param string $inet |
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* @return string |
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*/ |
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function inet_to_bits($inet) |
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{ |
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$unpacked = unpack('A16', $inet); |
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$unpacked = str_split($unpacked[1]); |
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$binaryip = ''; |
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foreach ($unpacked as $char) { |
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$binaryip .= str_pad(decbin(ord($char)), 8, '0', STR_PAD_LEFT); |
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} |
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return $binaryip; |
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} |
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/** |
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* Check if IPv6 address is in CIDR block |
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* |
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* @param string $ip |
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* @param string $cidr |
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* @return boolean |
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*/ |
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function ipv6_in_cidr($ip, $cidr) |
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{ |
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$inetIp = inet_pton($ip); |
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$binaryIp = inet_to_bits($inetIp); |
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if (strpos($cidr, '/') === false) { |
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$net = $cidr; |
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$mask = $cidr === '::' ? 0 : substr_count(rtrim($cidr, ':'), ':') * 16; |
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} else { |
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list($net, $mask) = explode('/', $cidr); |
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} |
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$inetNet = inet_pton($net); |
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$binaryNet = inet_to_bits($inetNet); |
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$ipNetBits = substr($binaryIp, 0, $mask); |
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$netBits = substr($binaryNet, 0, $mask); |
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return $ipNetBits === $netBits; |
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} |
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jasny /
php-functions
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